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United States Patent | 6,237,109 |
Achiwa ,   et al. | May 22, 2001 |
A standard physical medium 1320 as loaded into library unit 1080 even in the absence of any load request from a host computer 1020 is regarded as a spare physical medium 1330 for use when the standard physical medium 1320 is under malfunction, and such medium is put in a spare media storage space 1340 while eliminating issuance of any notice to the host computer 1020. Whereby, in a computer system with redundancy configuration, it becomes possible to prevent the host computer from making use of any spare physical media.
Inventors: | Achiwa; Kyosuke (Hino, JP); Yamamoto; Akira (Sagamihara, JP); Kitamura; Manabu (Ebina, JP) |
Assignee: | Hitachi, Ltd. (Tokyo, JP) |
Appl. No.: | 038816 |
Filed: | March 12, 1998 |
Mar 14, 1997[JP] | 9-060518 |
Current U.S. Class: | 714/6; 714/7 |
Intern'l Class: | H02H 003/05 |
Field of Search: | 714/6,7,5 707/204 360/92 |
4864438 | Sep., 1989 | Munro | 360/92. |
4914656 | Apr., 1990 | Dunphy, Jr. et al. | 371/10. |
4945429 | Jul., 1990 | Munro et al. | 360/92. |
5237468 | Aug., 1993 | Ellis | 360/92. |
5506986 | Apr., 1996 | Healey | 395/600. |
5778391 | Jul., 1998 | Fisher et al. | 707/204. |
5864655 | Jan., 1999 | Dewey et al. | 395/182. |
Aspinwall et al., "Troubleshooting Your PC", pp 47-49, Dec. 1991.* A Case for Redundant Arrays of Inexpensive Disks (Raid) by D. Patterson, Al, pp. 109-116, Chicago, IL, Jun. 1-3, 1988. Bell, "DVD Applications", Comdex '96, Slides 1-10, Nov. 20, 1996. |